Stallone's Blu Ray commentary
3 things stand out to me:
1. The sheer brutality of the filming, so many injuries and to himself, Dennehy as well(broken ribs). The sheer recklessness of how the actors were treated in the filming remains almost unique.
2. He basically dismisses the actors playing the National Guardsmen as amateurs and regrets their scene. Total diss.
3. He says near the end that "First Blood" remains the best action film he ever made!